Oxalis tetraphylla (common names: Good Luck Leaf)

i would'nt worry too much Chris, they quickly spread into clumps and you can dig them up spring or autumn and divide into more plants.

I bought this earlier in the year, didn't know it had such nice bright flowers, I'll be looking forward to those now!

I've got this one too. I had 2 last year, only 1 left and it's a smaller plant than last year. Not sure whether it's the cold winter or whether they are short lived perennials. I'm happy I've still got 1.

Great name Marguerite, i never realised it but now you come to mention it - it does close up at around four o'clock time. the proper name is Oxalis tetraphylla, and the common names i know for it are 'Lucky Clover' - would imagine because it has four leaves, and 'Iron Cross' - gues that would make sense from the markings in the centre of the leaves. this is just one of many reasons i love this site, you get to find out all the different names people have for things!

Aha, this one I recognise as 4o'clocks. The real name I do not know, but we call them that way as they close up at 4 pm, where they grow ( not here but in the cooler regions ) along the roads and in my garden before.
Beautiful shot of such a small flower. I love that clover leaf with it, such pretty markings, mine were just plain green.